Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | Download | RSS feed

  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
  28. *               DESCRIBE IT HERE!
  29. *
  30. ****************************************************************************/
  31.  
  32.  
  33. #include "variety.h"
  34. #include <string.h>
  35.  
  36. #ifdef M_I86
  37.  
  38. extern char _WCFAR *fast_strncpy( char _WCFAR *, const char _WCFAR *, size_t );
  39.  
  40. #pragma aux fast_strncpy = \
  41.         0x1e            /* push ds    */\
  42.         0x96            /* xchg si,ax */\
  43.         0x8e 0xd8       /* mov ds,ax  */\
  44.         0x57            /* push di */\
  45.         0xac            /* L1: lodsb */\
  46.         0xaa            /* stosb */\
  47.         0x84 0xc0       /* test al,al */\
  48.         0xe0 0xfa       /* loopne L1 */\
  49.         0x31 0xc0       /* xor ax,ax */\
  50.         0xd1 0xe9       /* shr cx,1 */\
  51.         0xf3 0xab       /* rep stosw */\
  52.         0x11 0xc9       /* adc cx,cx */\
  53.         0xf3 0xaa       /* rep stosb */\
  54.         0x58            /* pop ax */\
  55.         0x1f            /* pop ds */\
  56.         parm caller     [es di] [si ax] [cx]\
  57.         value           [es ax] \
  58.         modify exact    [ax cx si di];
  59. #endif
  60.  
  61. _WCRTLINK char _WCFAR *_fstrncpy( char _WCFAR *dst, const char _WCFAR *src, size_t len )
  62.     {
  63. #ifdef M_I86
  64.         if( len ) {
  65.             return( fast_strncpy( dst, src, len ) );
  66.         }
  67.         return( dst );
  68. #else
  69.         char _WCFAR *ret;
  70.  
  71.         ret = dst;
  72.         for(;len; --len ) {
  73.             if( *src == '\0' ) break;
  74.             *dst++ = *src++;
  75.         }
  76.         while( len != 0 ) {
  77.             *dst++ = '\0';      /* pad destination string with null chars */
  78.             --len;
  79.         }
  80.         return( ret );
  81. #endif
  82.     }
  83.